Pass if the text is NOT found on the text version of the page. The text version
is the equivalent of what a user would see when viewing through a web browser.
In other words the HTML has been filtered out of the contents.

Pass if the text IS found on the text version of the page. The text version
is the equivalent of what a user would see when viewing through a web browser.
In other words the HTML has been filtered out of the contents.

Gets the value of an HTTP response header. If multiple requests were
required to retrieve the page, only the headers from the last request will
be checked by default. However, if TRUE is passed as the second argument,
all requests will be processed…

Gets the HTTP response headers of the requested page. Normally we are only
interested in the headers returned by the last request. However, if a page
is redirected or HTTP authentication is in use, multiple requests will be
required to retrieve the…